Structural, morphological, and thermal characterization of kraft lignin and its charcoals obtained at different heating rates

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dc.citation.issue4
dc.citation.volumev. 5
dc.contributor.authorBrazil, Tayra Rodrigues [UNIFESP]
dc.contributor.authorCosta, Rogeria Nunes [UNIFESP]
dc.contributor.authorMassi, Marcos [UNIFESP]
dc.contributor.authorRezende, Mirabel Cerqueira [UNIFESP]
dc.coverageBristol
dc.date.accessioned2020-07-20T16:31:08Z
dc.date.available2020-07-20T16:31:08Z
dc.date.issued2018
dc.description.abstractBiomass is a renewable resource that is becoming more import due to environmental concerns and possible oil crisis. Thus, optimizing its use is a current challenge for many researchers. Lignin, which is a macromolecule with complex chemical structure, valuable physicochemical properties, and varied chemical composition, is available in large quantities in pulp and paper companies. The objective of this work is the physicochemical characterization of two Kraft lignin samples with different purities, and the study of its thermal conversion into charcoal. The lignin characterization was based on chemical, TGA, DSC, FT-IR, particle sizes, and FEG-SEM analyses. These analyses show that the lignins are mainly composed of guaiacyl and syringyl units, with residues of 30-36 wt.%, in inert atmosphere, depending on the lignin purity. From these results, the more purified lignin with higher carbon yield (%C) was selected for charcoal production. The heat treatment (HT) for carbonization of lignin, at different times (90, 180, and 420 min), resulted in different %C (41-44 wt.%). Longer HT resulted in higher %C and in charcoals with smaller pore sizes. Nanopores (similar to 50 nm) are observed for the charcoal obtained with the longest HT.en
dc.description.affiliationUniv Fed Sao Paulo, Inst Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUniv Prebiteriana Mackenzie, Sch Engn PPGEMN, BR-01302907 Sao Paulo, SP, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, Inst Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFAPESP
dc.description.sponsorshipCAPES/PVNS
dc.description.sponsorshipCNPq
dc.description.sponsorshipIDFAPESP: 2014/12918-5
dc.description.sponsorshipIDCNPq: 303287/2013-6
dc.identifierhttp://dx.doi.org/10.1088/2053-1591/aab7c2
dc.identifier.citationMaterials Research Express. Bristol, v. 5, n. 4, 2018.
dc.identifier.doi10.1088/2053-1591/aab7c2
dc.identifier.issn2053-1591
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/55737
dc.identifier.wosWOS:000429345800001
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofMaterials Research Express
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectkraft ligninen
dc.subjectcharacterizationen
dc.subjectcarbonizationen
dc.subjectcharcoalen
dc.titleStructural, morphological, and thermal characterization of kraft lignin and its charcoals obtained at different heating ratesen
dc.typeinfo:eu-repo/semantics/article
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